Technical Note

7/10

BA6950FS, BA6951FS

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2011.05 - Rev.C

© 2011 ROHM Co., Ltd. All rights reserved.

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External application components setting procedure

The relation between VCTL and the output high voltage is as follows.

····· (1)

VCTL: Torque control voltage

····· (2)

····· (3)

····· (4)

4 ( R2 + R3 )

x VTCL +

4 R3 R5

····· (5)

R1

R4

To drive the motor by constant speed as follows.

4 R3 R5

····· (6)

R4

R3, R4, and R5 are first set, and then R1 and R2 are set afterwards.

Table 4 External components

Parts

Default value

Parameter

Recommended condition

R1

22kΩ

R2 + R3

1kΩ + 1.5kΩ

R4

560Ω

R5

5.5Ω

C1

33pF

Please confirm the motor

operation

C2

0.1µF

C3, C4

0.1µF

C5, C6

1~100µF

VCC, VB

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Interfaces

Fig. 17 FIN, RIN

Fig.18 VCTL, RC, PCT

Fig.19 PC

Fig. 20 RT1, RT2

Fig.21 CS1, CS2

Fig.22 CS, TL

Fig.23 VB, ACT, M1,M2

(BA6950FS)

(BA6951FS)

FIN

RIN

24k

3.6k

10k

13.5k

10k

10k

VCTL

PCT

RC

1k

1k

20k

PC

1k

M2

M1

VB

ACT

RT1

1k

RT2

CS1

CS2

1k

1k

1k

CS

1k

TL